U.S. stocks plunged Thursday in their worst day since the 1987 crash. The Dow Jones Industrial Average fell 10%, and the S&P 500 and Nasdaq tumbled nearly as much to join the Dow in a bear market.
The furious falls in share prices on rising fears of a global slowdown due to the rapid spread of coronavirus occurred despite a $1.5 trillion intervention in short-term funding markets by the Federal Reserve.

U.S. stock futures surged in volatile trading on Friday as Wall Street tried to recoup some of the sharp losses suffered in the previous session — the worst since the “Black Monday” market crash in 1987.
S&P 500 futures jumped more than 5% to reach their “limit up” level. These limit levels act as a ceiling for buying until regular trading begins and are meant to insure orderly trading.
Read more: WSJ and CNBC.